Sewing machine controller



FIG. 1 is a front elevational view of a sewing machine controller showing my design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a sewing machine controller, substantially as shown. 